Perhaps you have encountered a situation where a residual current operated circuit breaker that has just been installed trips. What is the reason for this and how should it be resolved?

1. Three phase power lines, including the neutral line, pass through the zero sequence current transformer in the same direction and correct the wiring.

2. The installation of residual current operated circuit breakers is electrically connected to the circuit without residual current operated circuit breakers, separating the two circuits.

3. There is a phase to ground load in the line, so eliminate such loads.

4. The working neutral line passing through the zero sequence current transformer has a repeated grounding phenomenon, which should be ruled out.

5. The residual current operated circuit breaker itself has a fault and should be replaced.

6. If the leakage current of the circuit is too high, the insulation resistance of the wire is too low or the insulation is damaged, the insulation resistance of the circuit should be repaired and the insulation of the circuit should be treated properly.

7. The line is too long and has a large capacitance to ground. It should be replaced with a suitable residual current operated protector.

Extended reading:Current circuit breaker malfunction caused by improper operation